From d7627467b7a8dd6944885290a03a07ceb28c10eb Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 17 Aug 2010 23:52:56 +0100 Subject: Make do_execve() take a const filename pointer Make do_execve() take a const filename pointer so that kernel_execve() compiles correctly on ARM: arch/arm/kernel/sys_arm.c:88: warning: passing argument 1 of 'do_execve' discards qualifiers from pointer target type This also requires the argv and envp arguments to be consted twice, once for the pointer array and once for the strings the array points to. This is because do_execve() passes a pointer to the filename (now const) to copy_strings_kernel(). A simpler alternative would be to cast the filename pointer in do_execve() when it's passed to copy_strings_kernel(). do_execve() may not change any of the strings it is passed as part of the argv or envp lists as they are some of them in .rodata, so marking these strings as const should be fine. Further kernel_execve() and sys_execve() need to be changed to match. This has been test built on x86_64, frv, arm and mips. Signed-off-by: David Howells Tested-by: Ralf Baechle Acked-by: Russell King Signed-off-by: Linus Torvalds --- arch/m32r/kernel/process.c | 4 ++-- arch/m32r/kernel/sys_m32r.c | 4 +++- 2 files changed, 5 insertions(+), 3 deletions(-) (limited to 'arch/m32r') diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c index 8665a4d868ec..422bea9f1dbc 100644 --- a/arch/m32r/kernel/process.c +++ b/arch/m32r/kernel/process.c @@ -289,8 +289,8 @@ asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2, * sys_execve() executes a new program. */ asmlinkage int sys_execve(const char __user *ufilename, - char __user * __user *uargv, - char __user * __user *uenvp, + const char __user *const __user *uargv, + const char __user *const __user *uenvp, unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, struct pt_regs regs) { diff --git a/arch/m32r/kernel/sys_m32r.c b/arch/m32r/kernel/sys_m32r.c index 0a00f467edfa..d841fb6cc703 100644 --- a/arch/m32r/kernel/sys_m32r.c +++ b/arch/m32r/kernel/sys_m32r.c @@ -93,7 +93,9 @@ asmlinkage int sys_cachectl(char *addr, int nbytes, int op) * Do a system call from kernel instead of calling sys_execve so we * end up with proper pt_regs. */ -int kernel_execve(const char *filename, char *const argv[], char *const envp[]) +int kernel_execve(const char *filename, + const char *const argv[], + const char *const envp[]) { register long __scno __asm__ ("r7") = __NR_execve; register long __arg3 __asm__ ("r2") = (long)(envp); -- cgit v1.2.3